This month, the United Nations and the Syrian Arab Red Crescent (SARC) carried out their largest and most complex joint humanitarian aid convoy, providing lifesaving humanitarian assistance to 40,000 displaced people at the Rukban makeshift settlement in southeastern Syria near the borders with Jordan and Iraq.

Yesterday’s bad weather gave us a glimpse of what families must endure throughout the winter here in #Rukban, southeast #Syria. Torrential rain and very muddy conditions meant that getting into the camp itself took longer than usual. pic.twitter.com/XeLv2raA7T

The UN/SARC trucks also carried vaccines for approximately 10,000 children under the age of 5, as part of an emergency vaccination campaign against measles, polio and other diseases. The vast majority of the people stranded at Rukban are vulnerable women and children.

Offloading aid supplies by @UNinSyria & @SYRedCrescent started yesterday in #Rukban. We are joined by the community to help us offload from the big UN trucks into smaller ones that go into the camp. It’s a group effort but the bad weather makes it very challenging (vid:UN) pic.twitter.com/wH7TDbo9dZ

Rukban is a no man's land. There are practically no services, no basic health care. Access to safe, clean water is very limited. Food prices have soared.

"This large-scale delivery of essential humanitarian supplies to the extremely vulnerable in Rukban could not have happened a moment too soon," said UN Resident and Humanitarian Coordinator Sajjad Malik. "The humanitarian situation there has been deteriorating due to harsh winter conditions and the lack of access to basic assistance and services. There have been reports of at least eight young children's deaths in recent weeks."

Many children in #Rukban still can't access the specialized healthcare they need. @UNICEF is delivering vaccines and basic health supplies to thousands of children in the remote camp.

Fleeing air strikes, Syrian families began arriving at the camp in late 2015, hoping to cross to safety in Jordan. Since Jordan closed its border in 2016, they have been trapped in the harsh desert in Rukban.

Conditions in the settlement are desperate. "Children are walking around barefoot through puddles and mud, in cold and continuous rain," said Andrej Mahecic, a spokesperson for UNHCR, the Refugee Agency. Early marriage for girls is commonplace. Many women and girls are terrified to leave their mud homes or tents as there are serious risks of sexual abuse and harassment.

Children didn't start the conflict in Syria, but they are paying the highest price. UNICEF is working to provide urgent assistance to children affected by violence in Syria, including the millions who have been forced from their homes.